One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,9)(6,8)(7,10)(11,12)(13,16)(14,17)(15,19)(18,22)(20,24)(21,23)(25,26) involution — undirected(3,5,6,10)(4,7,8,9)(11,13)(12,16)(14,21)(15,20)(17,23)(18,25)(19,24)(22,26)(5,10)(7,9)(12,17)(14,22)(16,23)(18,19)(21,26)(24,25) involution — undirected(4,8)(7,9) involution — undirected(13,20)(16,24)(21,26)(23,25) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.